I think that the omega gravety gun is a script!
When you play the game, and that weird thing happens, a script starts to run.
There is no name for it, cuz when I was finnished with HL2, i wanted to cheat once.. So I wanted the Super gravety gun in C17..
So I tryed to get all the guns,, but nope..
(I did not use imoulse 101, I used give weapon_blaha)
And then a friend said that he thought it was a script so I got pissed and started to run around the house.. =/